CN114069764A

CN114069764A - Charging temperature compensation method and device for shared battery and power conversion equipment

Info

Publication number: CN114069764A
Application number: CN202111166072.XA
Authority: CN
Inventors: 戴永辉; 蒋日乾; 陈志彬; 王群兴
Original assignee: Kehua Data Co Ltd; Zhangzhou Kehua Electric Technology Co Ltd
Current assignee: Kehua Data Co Ltd; Zhangzhou Kehua Electric Technology Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-02-18

Abstract

The invention provides a charging temperature compensation method and device of a shared battery and power conversion equipment. The method comprises the following steps: acquiring sampling temperature obtained by detecting a common battery in a charging state by a temperature probe of the local power conversion equipment at a first moment and sampling temperature obtained by detecting the common battery by at least one first power conversion equipment at the first moment, and taking the sampling temperatures as first sampling temperatures; respectively calculating the difference value between the first sampling temperatures; if the difference value between the first sampling temperatures is smaller than a preset threshold value, determining the battery temperature corresponding to the shared battery at the first moment based on the first sampling temperatures; and determining the charging voltage adjustment amount of the shared battery at the second moment based on the battery temperature of the shared battery at the first moment and a preset compensation reference temperature so as to realize charging temperature compensation of the shared battery. The invention can realize the temperature compensation of the shared battery by fewer power conversion devices.

Description

Charging temperature compensation method and device for shared battery and power conversion equipment

Technical Field

The invention relates to the technical field of batteries, in particular to a charging temperature compensation method and device for a shared battery and power conversion equipment.

Background

An Uninterruptible Power Supply (UPS) includes an energy storage device, and when an external Power Supply is unstable, the UPS supplies Power to a load through the energy storage device to provide stable Power. In order to save cost and space, a plurality of UPSs may share one battery pack in an enterprise. Because the internal resistance of the battery is greatly influenced by the charging temperature, in order to avoid high-temperature overcharge and low-temperature undercharge, a temperature monitoring point is usually arranged on the UPS to acquire the temperature of the battery during charging, and the most appropriate charging voltage is determined by combining the temperature of the battery.

However, for a common battery pack, a plurality of UPSs can monitor the temperature of the battery pack, the battery temperature monitoring of all the UPSs may cause waste of resources, and a plurality of different battery temperatures may be obtained, which makes it difficult to determine the battery temperature for temperature compensation. Therefore, for a common battery pack, it is necessary to determine a temperature compensation method that can determine the battery temperature using the minimum number of temperature probes.

Disclosure of Invention

The embodiment of the invention provides a charging temperature compensation method and device for a shared battery and power conversion equipment, and aims to solve the problem of poor temperature compensation effect when the shared battery is charged.

In a first aspect, an embodiment of the present invention provides a method for compensating charging temperature of a shared battery, including:

acquiring sampling temperature obtained by detecting a common battery in a charging state by a temperature probe of the local power conversion equipment at a first moment and sampling temperature obtained by detecting the common battery by at least one first power conversion equipment at the first moment, and taking the sampling temperatures as first sampling temperatures; the first power conversion equipment is power conversion equipment which is connected with the shared battery except the local power conversion equipment;

respectively calculating the difference value between the first sampling temperatures;

if the difference value between the first sampling temperatures is smaller than a preset threshold value, determining the battery temperature corresponding to the shared battery at the first moment based on the first sampling temperatures;

determining a charging voltage adjustment amount of the shared battery at a second moment based on the battery temperature of the shared battery at the first moment and a preset compensation reference temperature so as to realize charging temperature compensation of the shared battery; the second time is a time after the first time.

In one possible implementation, the method further includes:

if the difference value between any two first sampling temperatures is larger than a preset threshold value, acquiring sampling temperatures obtained by detecting the shared battery at a second moment by the local power conversion equipment, the first power conversion equipment and at least one second power conversion equipment, and taking the sampling temperatures as second sampling temperatures; the second power conversion equipment is power conversion equipment which is connected with the shared battery except the local power conversion equipment and the first power conversion equipment;

respectively calculating the difference value between the second sampling temperatures to determine the outlier in the second sampling temperatures;

removing outliers in the second sampling temperatures, and determining the battery temperature corresponding to the common battery at the second moment based on the second sampling temperatures from which the outliers are removed;

determining a charging voltage adjustment amount of the shared battery at a third moment based on the battery temperature of the shared battery corresponding to the second moment and a preset compensation reference temperature so as to realize charging temperature compensation of the shared battery; the third time is a time after the second time.

In one possible implementation manner, after determining the charging voltage adjustment amount of the shared battery at the second time based on the battery temperature of the shared battery at the first time and a preset compensation reference temperature, the method further includes:

acquiring overvoltage protection points of each power conversion device;

calculating a charging voltage at a second time based on the charging voltage at the first time and the charging voltage adjustment amount at the second time;

if the power conversion equipment with the overvoltage protection point lower than the charging voltage at the second moment exists, taking the power conversion equipment with the overvoltage protection point lower than the charging voltage at the second moment as the power conversion equipment with temperature compensation at the second moment;

if there is no power conversion device having an overvoltage protection point lower than the charging voltage at the second time, at least one power conversion device is selected from the power conversion devices as a power conversion device to be subjected to temperature compensation at the second time.

In one possible implementation, after switching a power conversion device having an overvoltage protection point lower than the charging voltage at the second time as the second time to a temperature-compensated power conversion device, the method further includes:

determining a charging voltage adjustment amount at a third moment;

calculating a charging voltage at a third time based on the charging voltage at the second time and the charging voltage adjustment amount at the third time; the third moment is a moment after the second moment;

if the power conversion equipment with the overvoltage protection point lower than the charging voltage at the third moment exists, the power conversion equipment with the overvoltage protection point lower than the charging voltage at the third moment is used as the power conversion equipment with the temperature compensation at the third moment, and the power conversion equipment with the overvoltage protection point not lower than the charging voltage at the third moment in the power conversion equipment with the temperature compensation at the second moment is not used for temperature compensation at the third moment;

if there is no power conversion device having an overvoltage protection point lower than the charging voltage at the third time, at least one power conversion device is selected from the power conversion devices as a power conversion device to be subjected to temperature compensation at the third time.

In one possible implementation, the preset compensation reference temperature includes a first preset temperature and a second preset temperature; the charging voltage adjustment amount includes a charging voltage decrease amount and a charging voltage increase amount;

the method for determining the charging voltage adjustment amount of the shared battery at the second moment based on the battery temperature of the shared battery corresponding to the first moment and the preset compensation reference temperature so as to realize the charging temperature compensation of the shared battery comprises the following steps:

if the battery temperature of the shared battery at the first moment is lower than a first preset temperature, determining the increment of the charging voltage of the shared battery at a second moment based on the difference value between the battery temperature of the shared battery at the first moment and the first preset temperature;

if the battery temperature of the shared battery at the first moment is higher than a second preset temperature, determining the charge voltage reduction amount of the shared battery at the second moment based on the difference value between the battery temperature of the shared battery at the first moment and the second preset temperature;

and if the battery temperature of the common battery at the first moment is higher than the first preset temperature and lower than the second preset temperature, determining that the charging voltage adjustment quantity of the common battery at the second moment is zero.

In one possible implementation, the common battery includes at least one battery module;

determining the charging voltage increase amount of the common battery at the second moment based on the difference between the battery temperature of the common battery at the first moment and the first preset temperature comprises:

acquiring the charging voltage adjustment quantity of each battery module under a preset temperature step;

summing the charging voltage adjustment quantity of each battery module of the common battery under the preset temperature step length to obtain the charging voltage adjustment quantity of the common battery under the preset temperature step length;

computing

Obtaining the increment of the charging voltage of the shared battery at the second moment, wherein, Delta U₁Indicating the increase of the charging voltage, Δ T, at the second moment of the common battery₁And the difference value between the battery temperature corresponding to the common battery at the current moment and the first preset temperature is represented, t represents a preset temperature step length, and u represents the charging voltage adjustment amount of the common battery under the preset temperature step length.

determining the charging voltage reduction amount of the common battery at the second moment based on the difference value between the battery temperature of the common battery at the first moment and the second preset temperature comprises:

computing

Obtaining the increment of the charging voltage of the shared battery at the second moment, wherein, Delta U₂Indicating the amount of decrease, Δ T, in the charging voltage at the second moment of the common battery₂And the difference value between the battery temperature corresponding to the common battery at the first moment and the second preset temperature is represented, t represents a preset temperature step length, and u represents the charging voltage adjustment amount of the common battery under the preset temperature step length.

In a second aspect, an embodiment of the present invention provides a charging temperature compensation apparatus for a shared battery, including:

the acquisition module is used for acquiring sampling temperature obtained by detecting a shared battery in a charging state by a temperature probe of the local power conversion equipment at a first moment and sampling temperature obtained by detecting the shared battery by at least one first power conversion equipment at the first moment, and the sampling temperatures are used as first sampling temperatures; the first power conversion equipment is power conversion equipment which is connected with the shared battery except the local power conversion equipment;

the temperature difference calculation module is used for calculating difference values among the first sampling temperatures respectively;

the temperature determination module is used for determining the battery temperature corresponding to the shared battery at the first moment based on each first sampling temperature when the difference value between each first sampling temperature is smaller than a preset threshold value;

the voltage adjusting module is used for determining a charging voltage adjusting amount of the shared battery at a second moment based on the battery temperature of the shared battery at a first moment and a preset compensation reference temperature so as to realize charging temperature compensation of the shared battery; the second time is a time after the first time.

In a third aspect, an embodiment of the present invention provides a power conversion apparatus, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.

The embodiment of the invention provides a charging temperature compensation method and device of a shared battery and power conversion equipment, wherein the method comprises the following steps: acquiring sampling temperature obtained by detecting a common battery in a charging state by a temperature probe of the local power conversion equipment at a first moment and sampling temperature obtained by detecting the common battery by at least one first power conversion equipment at the first moment, and taking the sampling temperatures as first sampling temperatures; the first power conversion equipment is power conversion equipment which is connected with the shared battery except the local power conversion equipment; respectively calculating the difference value between the first sampling temperatures; if the difference value between the first sampling temperatures is smaller than a preset threshold value, determining the battery temperature corresponding to the shared battery at the first moment based on the first sampling temperatures; determining a charging voltage adjustment amount of the shared battery at a second moment based on the battery temperature of the shared battery at the first moment and a preset compensation reference temperature so as to realize charging temperature compensation of the shared battery; the second time is a time after the first time. According to the embodiment of the invention, the at least two temperature probes are used for acquiring the first sampling temperature of the shared battery, and when the difference value between the first sampling temperatures is not large, the temperature of the shared battery is determined through the first sampling temperature, so that the temperature compensation of the shared battery can be realized through less power conversion equipment.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a flowchart of a method for compensating charging temperature of a common battery according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a charging temperature compensation device for a shared battery according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a power conversion device provided by an embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.

Referring to fig. 1, it shows a flowchart of an implementation of the method for compensating charging temperature of a shared battery according to an embodiment of the present invention, which is detailed as follows:

step 101, acquiring sampling temperatures obtained by detecting a common battery in a charging state by a temperature probe of local power conversion equipment at a first moment and sampling temperatures obtained by detecting the common battery by at least one first power conversion equipment at the first moment, and taking the sampling temperatures as first sampling temperatures; the first power conversion device is a power conversion device connected to the common battery in addition to the home-side power conversion device.

In this embodiment, the power conversion device may be an uninterruptible power supply. The local power conversion equipment and the first power conversion equipment are respectively connected with the common battery. When the common battery is in a charging state, the local power conversion device and the first power conversion device charge the common battery at the same time at the same voltage. The present embodiment describes the method in the point of view of the local-end power conversion device, and the method is implemented in the same manner in the first power conversion device.

The plurality of power conversion devices are respectively connected with the common battery, and in order to activate the temperature probes as few as possible, in this embodiment, the local power conversion device and the temperature probes of the at least one first power conversion device are firstly activated, so as to obtain at least two first sampling temperatures. If the first sampled temperature enables determination of the battery temperature, the temperature probe need not be replaced. The local power conversion device is any one of a plurality of power conversion devices connected with a common battery, and the first power conversion device is other power conversion devices connected with the common battery except the local power conversion device. Each power conversion device corresponds to one temperature probe, and each temperature probe continuously detects the common battery so as to acquire the battery temperature of the common battery during charging. The local power conversion device and the first power conversion device may include a plurality of temperature probes, respectively, and when each temperature probe detects the common battery, the temperature probes may detect the temperature of the same portion of the common battery, or detect the temperatures of different portions of the common battery. The detection position can be determined according to actual conditions.

When the sampling temperature is obtained, the local power conversion equipment directly obtains the sampling temperature detected by the temperature probe corresponding to the local power conversion equipment. After acquiring the sampling temperature detected by the temperature probe corresponding to the first power conversion equipment, the first power conversion equipment sends the sampling temperature to the local-end power conversion equipment, so that the local-end power conversion equipment acquires the sampling temperature detected by each temperature probe. The local power conversion device also needs to send the acquired sampling temperature to the first power conversion device, so that the first power conversion device can also acquire the sampling temperature detected by each temperature probe.

And 102, respectively calculating the difference value between the first sampling temperatures.

In this embodiment, since each first sampling temperature is from a different temperature probe, the sampling temperatures acquired by the local power conversion device are difficult to be completely the same due to the different detection parts and/or the different accuracy of the temperature probes, and therefore, the difference between the first sampling temperatures needs to be determined.

Step 103, if the difference value between the first sampling temperatures is smaller than a preset threshold value, determining the battery temperature corresponding to the common battery at the first moment based on the first sampling temperatures.

In this embodiment, if the difference between the first sampling temperatures is smaller than the preset threshold, that is, there is no great difference between the first sampling temperatures, it indicates that the first sampling temperatures are more accurate, and the temperature compensation can be performed on the battery based on the first sampling temperatures. Since each first sampling temperature is hardly identical, the local-end power conversion device needs to determine the actual battery temperature of the common battery based on each sampling temperature to perform charging temperature compensation on the common battery. For example, the local power conversion device may take an average value, a maximum value, or a minimum value of the respective sampling temperatures as the battery temperature of the common battery. If the number of the first sampling temperatures is large, the local-end power conversion device can also calculate statistical parameters such as the mode, the median and the like of each first sampling temperature as the battery temperature of the shared battery. The manner of determining the battery temperature may be selected by experiment.

104, determining a charging voltage adjustment amount of the shared battery at a second moment based on the battery temperature of the shared battery at the first moment and a preset compensation reference temperature so as to realize charging temperature compensation of the shared battery; the second time is a time after the first time.

In this embodiment, the compensation reference temperature indicates a temperature range in which the internal resistance of the common battery is relatively stable, and if the battery temperature of the common battery corresponding to the current time is within the temperature range, the local power conversion device may not perform charging temperature compensation on the common battery; if the battery temperature corresponding to the common battery at the current moment is not within the temperature range, the internal resistance of the common battery is changed, and the local power conversion device needs to determine the internal resistance of the common battery at the current moment according to the battery temperature corresponding to the common battery at the current moment so as to perform charging temperature compensation on the common battery.

In some embodiments, the method further comprises:

In this embodiment, if there is a difference between two first sampling temperatures greater than the preset threshold, it may be that a certain first sampling temperature is inaccurate, and there is still an inactive temperature probe. In order to obtain a more accurate sampling temperature, a new temperature probe may be added at a second time to obtain a greater number of second sampling temperatures. And comparing the second sampling temperatures again, removing the outlier second sampling temperature as an abnormal value, and taking the residual second sampling temperature as a normal value. And then, continuously determining the battery temperature at the second moment on the basis, so as to ensure the accuracy of temperature compensation.

In some embodiments, after step 104, the method further comprises:

acquiring overvoltage protection points of each power conversion device;

In this embodiment, after determining the charge voltage adjustment amount at the second time, it is necessary to determine a power conversion device to be subjected to temperature compensation in order to adjust the charge voltage of the common battery. The adjustment of the charging voltage for the common battery also follows the principle of enabling the least devices. Since the overvoltage protection points of the power conversion devices are different and the overvoltage protection points of the power conversion devices change with the operating voltage of the power conversion devices, the overvoltage protection points of the current power conversion devices should be considered when selecting the power conversion devices to be subjected to temperature compensation.

Specifically, if there is a power conversion device whose overvoltage protection point is lower than the charging voltage at the second time, the power conversion device is subjected to temperature compensation at the second time, so that the overvoltage protection point of the power conversion device changes to be higher than the charging voltage at the second time, and the overvoltage protection can be prevented from being triggered.

Meanwhile, for the power conversion device of which the overvoltage protection point is not lower than the charging voltage at the second moment, the overvoltage protection does not occur without inputting temperature compensation. In order to realize temperature compensation, any one or a specified number of power devices can be selected to be subjected to temperature compensation. On the basis that the power conversion equipment with the overvoltage protection point lower than the charging voltage at the second moment does not exist, different power conversion equipment can be used for temperature compensation at each moment, so that the power conversion equipment participates in the temperature compensation in turn, and the utilization rate of the equipment is improved on the premise of the minimum starting quantity.

In some embodiments, after switching the power conversion device having the overvoltage protection point lower than the charging voltage at the second time as the second time to a temperature-compensated power conversion device, the method further includes:

determining a charging voltage adjustment amount at a third moment;

In this embodiment, the power conversion device to which the temperature compensation is applied at the second time may be the same as or different from the power conversion device to which the temperature compensation is applied at the third time.

Specifically, if the overvoltage protection point of the power conversion device a at the first time is lower than the charging voltage at the second time, the power conversion device a needs to be subjected to temperature compensation at the second time to prevent the power conversion device a from generating overvoltage protection, and the corresponding overvoltage protection point of the power conversion device a changes at the second time and is marked as the overvoltage protection point at the second time; after the power conversion device a is subjected to temperature compensation at the second time, the local power conversion device calculates a charging voltage at the third time based on the battery temperature at the second time, and then compares the overvoltage protection point at the second time with the charging voltage at the third time. If the overvoltage protection point at the second time is higher than the charging voltage at the third time, the power conversion device a does not need to be subjected to temperature compensation at the third time, and if a power conversion device which needs to be subjected to temperature compensation at the third time exists, the power conversion device a can quit the temperature compensation at the third time, so that the number of power conversion devices participating in the temperature compensation at the third time is minimized.

In some embodiments, the preset compensated reference temperature comprises a first preset temperature and a second preset temperature; the charging voltage adjustment amount includes a charging voltage decrease amount and a charging voltage increase amount;

In the present embodiment, the compensation reference temperature is used to define a temperature range in which the internal resistance of the common battery is normal and charging temperature compensation is not required. The compensation reference temperature can be represented by a temperature interval [ a first preset temperature, a second preset temperature ], wherein the first preset temperature is a lower limit of the compensation reference temperature, and the second preset temperature is an upper limit of the compensation reference temperature, and specifically can be [20 ℃,30 ℃).

If the battery temperature corresponding to the common battery at the current moment is lower than the first preset temperature, the internal resistance of the common battery is higher than a normal value, and the charging voltage needs to be increased; if the battery temperature corresponding to the common battery at the current moment is higher than the second preset temperature, the internal resistance of the common battery is lower than a normal value, and the charging voltage needs to be reduced.

In some embodiments, the common battery includes at least one battery module;

computing

In this embodiment, in order to obtain a larger output current or output voltage, the common battery may be a battery pack including a plurality of battery modules connected in parallel or in series. When the power conversion device charges the series/parallel battery pack, the charging voltage is equally distributed to each battery module, and correspondingly, when the charging voltage is adjusted, the adjustment amount of the charging voltage is also equally distributed to the charging voltage of each battery module. Therefore, the adjustment amount of the charging voltage for the battery pack is the sum of the adjustment amounts of the charging voltage for the respective battery modules in the battery pack.

For example, the preset temperature step in the present embodiment may be 1 ℃, and the adjustment amount of the charging voltage of each battery module at the preset temperature step is 2 mv/deg.c. Assuming that the common battery comprises 6 identical battery modules connected in series, the charging voltage of the common battery at a preset temperature step is adjusted by 2 × 6-12 mv/deg.c, i.e. the charging voltage of the common battery at the next moment needs to be increased by 12mv every time the temperature of the common battery at the current moment is 1 ℃ lower than the first preset temperature.

In some embodiments, the common battery includes at least one battery module;

computing

In this embodiment, the charging voltage adjustment amount of the battery module may also be determined according to the internal resistance of the battery module according to the temperature variation characteristic. Specifically, the local power conversion device determines the internal resistance of the battery module at the current time according to the internal resistance of the battery module changing with temperature and the battery temperature of the battery module at the current time, then determines the charging voltage corresponding to the internal resistance of the battery module at the current time, and finally determines the charging voltage adjustment amount of the battery module at the next time based on the charging voltage of the battery module at the current time and the charging voltage corresponding to the internal resistance of the battery module at the current time, so as to adjust the charging voltage at the next time.

In some specific embodiments, the maximum value of the sampled temperatures corresponding to the current time may also be used as the battery temperature of the common battery corresponding to the current time.

In this embodiment, because the internal resistance of the battery is low when the temperature is high, the battery needs to be charged with a low charging voltage to avoid overcharging, and the internal resistance of the battery is high when the temperature is low, the battery needs to be charged with a high charging voltage to fully charge, where the battery has a high risk to the safety of the battery and the service life of the battery when overcharged, and in order to safely use and prolong the service life of the shared battery, the local-end power conversion device may select the maximum value of the sampling temperatures as the battery temperature corresponding to the shared battery at the current time.

In some specific embodiments, after taking the maximum value of the sampled temperatures corresponding to the current time as the battery temperature of the common battery corresponding to the current time, the method further includes:

and if the battery temperature corresponding to the current moment of the common battery is lower than the preset lowest temperature, taking the preset lowest temperature as the battery temperature corresponding to the current moment of the common battery.

And if the battery temperature corresponding to the current moment of the shared battery is higher than the preset highest temperature, taking the preset highest temperature as the battery temperature corresponding to the current moment of the shared battery.

In this embodiment, when the battery temperature of the common battery is too high or too low, the charging voltage cannot be increased or decreased without limitation, so it is necessary to set the upper limit and the lower limit of the battery temperature of the common battery, that is, the preset maximum temperature and the preset minimum temperature, to perform charging temperature compensation. The preset maximum temperature may be 40 deg.c and the preset minimum temperature may be 0 deg.c. If the battery temperature corresponding to the current moment of the shared battery is too low, the local-end power conversion equipment uses the preset lowest temperature to perform charging temperature compensation on the shared battery; and if the temperature of the battery corresponding to the current moment of the shared battery is too high, the local power conversion equipment uses the preset highest temperature to perform charging temperature compensation on the shared battery.

The method provided by the embodiment of the invention comprises the following steps: acquiring sampling temperature obtained by detecting a common battery in a charging state by a temperature probe of the local power conversion equipment at a first moment and sampling temperature obtained by detecting the common battery by at least one first power conversion equipment at the first moment, and taking the sampling temperatures as first sampling temperatures; the first power conversion equipment is power conversion equipment which is connected with the shared battery except the local power conversion equipment; respectively calculating the difference value between the first sampling temperatures; if the difference value between the first sampling temperatures is smaller than a preset threshold value, determining the battery temperature corresponding to the shared battery at the first moment based on the first sampling temperatures; determining a charging voltage adjustment amount of the shared battery at a second moment based on the battery temperature of the shared battery at the first moment and a preset compensation reference temperature so as to realize charging temperature compensation of the shared battery; the second time is a time after the first time. According to the embodiment of the invention, the at least two temperature probes are used for acquiring the first sampling temperature of the shared battery, and when the difference value between the first sampling temperatures is not large, the temperature of the shared battery is determined through the first sampling temperature, so that the temperature compensation of the shared battery can be realized through less power conversion equipment.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.

Fig. 2 is a schematic structural diagram of a charging temperature compensation device for a shared battery according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:

as shown in fig. 2, the common battery charging temperature compensation device 2 includes:

an obtaining module 21, configured to obtain a sampling temperature obtained by detecting, by a temperature probe of a local power conversion device at a first time, a common battery in a charging state, and a sampling temperature obtained by detecting, by at least one first power conversion device, the common battery at the first time, and use the sampling temperature as a first sampling temperature; the first power conversion equipment is power conversion equipment which is connected with the shared battery except the local power conversion equipment;

the temperature difference calculation module 22 is used for calculating the difference value between the first sampling temperatures respectively;

the temperature determining module 23 is configured to determine, based on each first sampling temperature, a battery temperature of the common battery at a first time when the difference value between each first sampling temperature is smaller than a preset threshold;

the voltage adjusting module 24 is configured to determine a charging voltage adjustment amount of the shared battery at a second time based on a battery temperature of the shared battery at the first time and a preset compensation reference temperature, so as to implement charging temperature compensation for the shared battery; the second time is a time after the first time.

In some embodiments, the obtaining module 21 is further configured to, when a difference between any two first sampling temperatures is greater than a preset threshold, obtain a sampling temperature obtained by detecting the shared battery by the local-end power conversion device, the first power conversion device, and the at least one second power conversion device at a second time, and use the sampling temperature as a second sampling temperature; the second power conversion equipment is power conversion equipment which is connected with the shared battery except the local power conversion equipment and the first power conversion equipment;

the temperature difference calculation module 22 is further configured to calculate a difference between each of the second sampling temperatures, respectively, to determine an outlier in each of the second sampling temperatures;

the temperature determining module 23 is further configured to remove an outlier in each second sampling temperature, and determine a battery temperature corresponding to the common battery at the second time based on each second sampling temperature from which the outlier is removed;

the voltage adjusting module 24 is further configured to determine a charging voltage adjustment amount of the shared battery at a third time based on the battery temperature of the shared battery at the second time and a preset compensation reference temperature, so as to implement charging temperature compensation for the shared battery; the third time is a time after the second time.

In some embodiments, the obtaining module 21 is further configured to obtain the overvoltage protection point of each power conversion device after determining the charging voltage adjustment amount of the shared battery at the second time based on the battery temperature of the shared battery at the first time and a preset compensation reference temperature;

the common battery charging temperature compensation device 2 further includes:

a voltage calculating module 25, configured to calculate a charging voltage at a second time based on the charging voltage at the first time and the charging voltage adjustment amount at the second time;

the device selection module 26 is configured to, when there is a power conversion device whose overvoltage protection point is lower than the charging voltage at the second time, take the power conversion device whose overvoltage protection point is lower than the charging voltage at the second time as a power conversion device which is subjected to temperature compensation at the second time;

and selecting at least one power conversion device among the power conversion devices as a power conversion device to be temperature-compensated at the second time when there is no power conversion device having an overvoltage protection point lower than the charging voltage at the second time.

In some embodiments, the voltage adjustment module 24 is further configured to determine a charging voltage adjustment amount at a third time after putting a power conversion device with an overvoltage protection point lower than the charging voltage at the second time as a temperature-compensated power conversion device at the second time;

the voltage calculating module 25 is further configured to calculate a charging voltage at a third time based on the charging voltage at the second time and the charging voltage adjustment amount at the third time; the third moment is a moment after the second moment;

the device selection module 26 is further configured to, when there is a power conversion device with an overvoltage protection point lower than the charging voltage at the third time, take the power conversion device with the overvoltage protection point lower than the charging voltage at the third time as a power conversion device which is put into temperature compensation at the third time, and the power conversion device with the overvoltage protection point not lower than the charging voltage at the third time in the power conversion device which is put into temperature compensation at the second time does not put into temperature compensation at the third time;

and selecting at least one power conversion device among the power conversion devices as a power conversion device to be subjected to temperature compensation at the third time when there is no power conversion device having an overvoltage protection point lower than the charging voltage at the third time.

the voltage adjustment module 24 includes:

the voltage increasing unit is used for determining the charging voltage increase amount of the shared battery at a second moment based on the difference value between the battery temperature of the shared battery at the first moment and the first preset temperature when the battery temperature of the shared battery at the first moment is lower than the first preset temperature;

the voltage reduction unit is used for determining the charge voltage reduction amount of the shared battery at a second moment based on the difference value between the battery temperature of the shared battery at the first moment and a second preset temperature when the battery temperature of the shared battery at the first moment is higher than the second preset temperature;

and the voltage maintaining unit is used for determining that the charging voltage adjustment amount of the shared battery at the second moment is zero when the battery temperature of the shared battery corresponding to the first moment is higher than the first preset temperature and lower than the second preset temperature.

In some embodiments, the common battery includes at least one battery module;

the voltage increasing unit is specifically configured to:

computing

Obtain the second time of the common batteryIncreased charging voltage by Δ U₁Indicating the increase of the charging voltage, Δ T, at the second moment of the common battery₁And the difference value between the battery temperature corresponding to the common battery at the current moment and the first preset temperature is represented, t represents a preset temperature step length, and u represents the charging voltage adjustment amount of the common battery under the preset temperature step length.

In some embodiments, the common battery includes at least one battery module;

the voltage reduction unit is specifically configured to:

computing

Fig. 3 is a schematic diagram of a power conversion device provided by an embodiment of the present invention. As shown in fig. 3, the power conversion apparatus 3 of this embodiment includes: a processor 30, a memory 31 and a computer program 32 stored in said memory 31 and executable on said processor 30. The processor 30, when executing the computer program 32, implements the steps in the above-mentioned embodiments of the method for compensating the charging temperature of the common battery, such as the steps 101 to 103 shown in fig. 2. Alternatively, the processor 30, when executing the computer program 32, implements the functions of the modules/units in the above-mentioned device embodiments, such as the modules/units 21 to 23 shown in fig. 3.

Illustratively, the computer program 32 may be partitioned into one or more modules/units that are stored in the memory 31 and executed by the processor 30 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 32 in the power conversion device 3. For example, the computer program 32 may be divided into the modules/units 21 to 23 shown in fig. 2.

The power conversion device 3 may include, but is not limited to, a processor 30, a memory 31. Those skilled in the art will appreciate that fig. 3 is merely an example of the power conversion device 3, and does not constitute a limitation of the power conversion device 3, and may include more or less components than those shown, or combine certain components, or different components, for example, the power conversion device may also include an input-output device, a network access device, a bus, etc.

The Processor 30 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 31 may be an internal storage unit of the power conversion apparatus 3, such as a hard disk or a memory of the power conversion apparatus 3. The memory 31 may also be an external storage device of the power conversion device 3, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like provided on the power conversion device 3. Further, the memory 31 may also include both an internal storage unit of the power conversion apparatus 3 and an external storage device. The memory 31 is used for storing the computer program and other programs and data required by the power conversion device. The memory 31 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/power conversion device and method can be implemented in other ways. For example, the above-described apparatus/power conversion device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division manners in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the method for compensating the charging temperature of the common battery may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. A method for compensating for a charging temperature of a shared battery, comprising:

acquiring sampling temperature obtained by detecting a common battery in a charging state by a temperature probe of local power conversion equipment at a first moment and sampling temperature obtained by detecting the common battery by at least one first power conversion equipment at the first moment, and taking the sampling temperatures as first sampling temperatures; the first power conversion device is a power conversion device connected to the common battery except for the home terminal power conversion device;

if the difference value between the first sampling temperatures is smaller than a preset threshold value, determining the battery temperature corresponding to the common battery at the first moment based on the first sampling temperatures;

determining a charging voltage adjustment amount of the common battery at a second moment based on the battery temperature of the common battery at a first moment and a preset compensation reference temperature so as to realize charging temperature compensation of the common battery; the second time is a time after the first time.

2. The method of compensating for charging temperature of a shared battery as claimed in claim 1, further comprising:

if the difference value between any two first sampling temperatures is larger than a preset threshold value, acquiring sampling temperatures obtained by detecting the shared battery by the local power conversion equipment, the first power conversion equipment and at least one second power conversion equipment at a second moment, and taking the sampling temperatures as second sampling temperatures; the second power conversion device is a power conversion device connected to the common battery except for the home power conversion device and the first power conversion device;

determining a charging voltage adjustment amount of the common battery at a third moment based on the battery temperature of the common battery corresponding to the second moment and a preset compensation reference temperature so as to realize charging temperature compensation of the common battery; the third time is a time after the second time.

3. The method for compensating for the charging temperature of the common battery according to claim 1, wherein after determining the charging voltage adjustment amount of the common battery at the second time based on the battery temperature of the common battery at the first time and a preset compensation reference temperature, the method further comprises:

acquiring overvoltage protection points of each power conversion device;

4. The method for compensating for the charging temperature of the common battery according to claim 3, wherein after putting a power conversion device having an overvoltage protection point lower than the charging voltage at the second timing as the power conversion device to be temperature-compensated at the second timing, the method further comprises:

determining a charging voltage adjustment amount at a third moment;

5. The common battery charging temperature compensation method according to any one of claims 1 to 4, wherein the preset compensation reference temperature includes a first preset temperature and a second preset temperature; the charging voltage adjustment amount includes a charging voltage decrease amount and a charging voltage increase amount;

the determining a charging voltage adjustment amount of the common battery at a second moment based on the battery temperature of the common battery at a first moment and a preset compensation reference temperature to realize charging temperature compensation of the common battery comprises:

if the battery temperature of the common battery at the first moment is lower than the first preset temperature, determining the increment of the charging voltage of the common battery at the second moment based on the difference value between the battery temperature of the common battery at the first moment and the first preset temperature;

if the battery temperature of the common battery at the first moment is higher than the second preset temperature, determining the charge voltage reduction amount of the common battery at the second moment based on the difference value between the battery temperature of the common battery at the first moment and the second preset temperature;

6. The method of claim 5, wherein the common battery comprises at least one battery module;

the determining of the increment of the charging voltage of the shared battery at the second moment based on the difference between the battery temperature of the shared battery at the first moment and the first preset temperature comprises:

summing the charging voltage adjustment quantity of each battery module of the common battery under a preset temperature step length to obtain the charging voltage adjustment quantity of the common battery under the preset temperature step length;

computing

Obtaining the increment of the charging voltage of the common battery at the second moment, wherein，ΔU₁Indicates the increment of the charging voltage, delta T, of the common battery at the second moment₁And the difference value between the battery temperature corresponding to the common battery at the current moment and the first preset temperature is represented, t represents a preset temperature step length, and u represents the charging voltage adjustment amount of the common battery under the preset temperature step length.

7. The method of claim 5, wherein the common battery comprises at least one battery module;

the determining the charging voltage reduction amount of the common battery at the second moment based on the difference between the battery temperature of the common battery at the first moment and the second preset temperature comprises:

computing

Obtaining the increment of the charging voltage of the common battery at the second moment, wherein the increment is Delta U₂Indicating a charge voltage decrease amount, Δ T, of the common battery at a second time₂And the difference value between the battery temperature corresponding to the common battery at the first moment and the second preset temperature is represented, t represents a preset temperature step length, and u represents the charging voltage adjustment amount of the common battery under the preset temperature step length.

8. A charging temperature compensation device for a shared battery, comprising:

the acquisition module is used for acquiring sampling temperature obtained by detecting a shared battery in a charging state by a temperature probe of local power conversion equipment at a first moment and sampling temperature obtained by detecting the shared battery by at least one first power conversion equipment at the first moment, and the sampling temperatures are used as first sampling temperatures; the first power conversion device is a power conversion device connected to the common battery except for the home terminal power conversion device;

the temperature determination module is used for determining the battery temperature corresponding to the common battery at a first moment based on each first sampling temperature when the difference value between each first sampling temperature is smaller than a preset threshold value;

the voltage adjusting module is used for determining a charging voltage adjusting amount of the shared battery at a second moment based on the battery temperature of the shared battery corresponding to the first moment and a preset compensation reference temperature so as to realize charging temperature compensation of the shared battery; the second time is a time after the first time.

9. A power conversion device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.